--- /dev/null
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 6f6c8eca2..00366ae53 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -405,7 +405,7 @@ if(WEBP_BUILD_CWEBP)
+ install(TARGETS cwebp RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})\r
+ endif()\r
+ \r
+-if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP)\r
++if(WEBP_BUILD_GIF2WEBP OR WEBP_BUILD_IMG2WEBP OR TRUE)\r
+ parse_makefile_am(${CMAKE_CURRENT_SOURCE_DIR}/src/mux "WEBP_MUX_SRCS" "")\r
+ add_library(libwebpmux ${WEBP_MUX_SRCS})\r
+ target_link_libraries(libwebpmux webp)\r